1 /* 2 * GRUB -- GRand Unified Bootloader 3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 /* 20 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 21 * Use is subject to license terms. 22 */ 23 24 #ifndef _ZIO_H 25 #define _ZIO_H 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #define ZBT_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */ 30 31 typedef struct zio_block_tail { 32 uint64_t zbt_magic; /* for validation, endianness */ 33 zio_cksum_t zbt_cksum; /* 256-bit checksum */ 34 } zio_block_tail_t; 35 36 /* 37 * Gang block headers are self-checksumming and contain an array 38 * of block pointers. 39 */ 40 #define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE 41 #define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \ 42 sizeof (zio_block_tail_t)) / sizeof (blkptr_t)) 43 #define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \ 44 sizeof (zio_block_tail_t) - \ 45 (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\ 46 sizeof (uint64_t)) 47 48 #define ZIO_GET_IOSIZE(zio) \ 49 (BP_IS_GANG((zio)->io_bp) ? \ 50 SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp)) 51 52 typedef struct zio_gbh { 53 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS]; 54 uint64_t zg_filler[SPA_GBH_FILLER]; 55 zio_block_tail_t zg_tail; 56 } zio_gbh_phys_t; 57 58 enum zio_checksum { 59 ZIO_CHECKSUM_INHERIT = 0, 60 ZIO_CHECKSUM_ON, 61 ZIO_CHECKSUM_OFF, 62 ZIO_CHECKSUM_LABEL, 63 ZIO_CHECKSUM_GANG_HEADER, 64 ZIO_CHECKSUM_ZILOG, 65 ZIO_CHECKSUM_FLETCHER_2, 66 ZIO_CHECKSUM_FLETCHER_4, 67 ZIO_CHECKSUM_SHA256, 68 ZIO_CHECKSUM_FUNCTIONS 69 }; 70 71 #define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_2 72 #define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON 73 74 enum zio_compress { 75 ZIO_COMPRESS_INHERIT = 0, 76 ZIO_COMPRESS_ON, 77 ZIO_COMPRESS_OFF, 78 ZIO_COMPRESS_LZJB, 79 ZIO_COMPRESS_EMPTY, 80 ZIO_COMPRESS_FUNCTIONS 81 }; 82 83 #endif /* _ZIO_H */ 84